Mechanical movement



(No Model.) 2 Sheets-Sheet 1. D. M. LESTER.

MECHANICAL MOVEMENT.

No. 394,585. Patented Dec. 18, 1888 'flllllllllllllii/fi- W7 QWQx ML 3 attozmm a. mans. PhmoLilhogl-aphar, Wnhingmn. o. c,

(No MmieL) 2 Sheets-Sheet 2* D. M. LESTER.

MECHANICAL MOVEMENT.

No. 394,585. Patented Dec. 18, 1888.

' 7'02 aggwzsszs Jan; zigzag I fi iafi/m,

.zlliorney UNITED STATES PATENT OFFICE.

DANIEL M. LESTER, OF NOR\VICH, CONNECTICUT.

. MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 394,585, dated. December 18, 1888.

Application filed May 31, 1888.

To all whont it may concern.-

Be it known that I, DANIEL M. LEsTER, a citizenof the United States, residing at Norwich, in the county of New London and State of Connecticut, have invented certain new and useful Improvements in Mechanical Movements, which improvements are fully set forth and described in the following specification, reference being had to the accompanying sheets of drawings, in which- Figure 1 is an end view of two adjacent shafts having attached thereto and in operative connection the machine elements that combined form my said invention. Fig. 2 is a slightly-enlarged sectional view on line 00 of Fig. 1. Fig. 3 is a view of a portion of rockshaft 1), showing attached thereto so much of arms (I, e, and m as is necessary to explain the manner of assembling said parts. Fig. at is a view similar to Fig. 1, showing'the duplex cam in a position farthest removed from the rock-shaft Z).

The particular object of the said invention is to provide mechanism for transmitting the rotary movement of one shaft into an oscillating or rocking motion when connected with an adjacent shaft, and also to provide a safety device or attachment which works in unison with said rock-shaft so long as the machine of which said rock-shaft is an elementary part works properly, but which allows the rotating shaft to continue its movement when the machine becomes clogged or otherwise hampered.

The mechanism illustrated provides a form of cam that acts positively at all points to move its engaging-arms instead of depending on gravity or springs to hold said arms in engagement with the cam-faces, and, further, provides a device that acts automatically to hold the operative parts in engagement when they become worn and reduced in size. Such a mechanical movement is applicable to various classes of machinery as, for example, envelope machinery, spool-turning machinery, and the like mechanisms-in which a reciprocating or rocking movement is desired.

Referring to the drawings, the letter (1V indicates a shaft which, for the purpose of explaining my said invention, is assumed to be capable of continuous rotary movement in either direction.

Serial No. 275,670. (No model.)

1) denotes a rock-shaft located adjacent to shaft a, having fitted loosely thereon a collar, 0, bearing an integral arm, (7, projecting toward and beneath shaft (1, and carrying in or on its free end a roll, (1'.

6 denotes a collar, bored to fit loosely 011 the loose collar c, above referred to. This collar 6 has an integral arm, e, corresponding to arm (I, and projects toward and above shaft 1!. Arm 6' carries at its free end a. roll Arms (Z c are held in approximately the same positions relative to each other by an arm, 71, that extends from arm c past the companion arm (1, and is formed with an upturned end, 71, to receive a set-screw, i.

Between the upturned end of arm 71 and the confronting edge of arm (l is a packing, k, of rubber or similar yielding material, and also a block, I.'., that forms a gib, against which the set-screw L may act. \V hen in action, as hereinafter explained, the packing k relieves the rigidity which would naturally accompany a lever in which the arms (I 6' were integral with each other, and also acts to hold the rolls (1 f in constant engagement with their respective cams, even if said cams or rolls were somewhat worn and reduced in diameter.

Clamped fixedly to shaft 1) is an arm, :11, whose free end is connected with arm e by a spiral spring, 12, arm a being formed with an eye, a, for the purpose. This arm on is formed with a lug, m, in which is located a set-screw, 0, whose end engages and abuts the edge of arm '6. Spring a should be of considerable strength, and acts (so long as the machine works properly) to hold arms on and c in such fixed relai ions that they move together, and are practically as if cast of a single piece of metal. A convenient means of adjustment of spring a is provided in set-screw 0, above described. Fuder this provision the spring may be attached in its closed position with little effort, and afterward strained to the desired degree of tension by means of screw 0.

Located fixedly on shaft a is a compound cam whose sections 1) r are offset and overlap each other, being of such size and shape that they may engage, respectively, the rolls (1 f, and each remain in such engagement throughout the complete revolution of shaft a. One

section, 0', acts to lift the arms (I e, and thus rock arm m and shaft 1). The companion cam 10 serves to move said rocking parts in the opposite direction.

When in practical service, should those parts of a machine that are connected with the said shaft 1) fail to work properly, so that said shaft could not rock in its bearings, the spring 12 would yield, as shown in dotted lines in Fig. 1, at each revolution of the cam-shaft and the shaft 1') would remain stationary, thus avoiding injury to the operative parts of the attached machine. Mechanism, as described,

may be applied advantageously to various classes of automatic machinery, and, as it acts positivelyin both directions and is provided with the described safety attachment, the

speed of such machines may be materially in-..

creased without fear of injury or accident.

The yielding or cushioned connection provided in arm h forms a valuable feature of my invention and could be used with advantagewith this class of cams without the safetyarm m and spring 71.

Having described my invention, I claim- 1. In combination with a rock-shaft and a continuously-rotatin shaft adjacent thereto, a duplex cam fixed on the latter, formed of two offset overlapping sections, as set forth, lever-arms cl e, hung loosely on said rockshaft, carryingin their free ends rolls that engage said duplex cam, an arm secured to said rock-shaft, and a spring connecting said arm and the arms 61 6, all substantially as and for the object specified.

2. In combination with a rock-shaft and a continuously-rotating shaft adjacent thereto, a duplex cam fixed on the latter, formed of two offset overlapping sections, as set forth, lever-arms d e, hung on said rock-shaft, connected with each other by a cushioned arm,

asset forth, and carrying in their free ends rolls that engage said duplex cam, substantially as and for the object specified.

3. In combination with a rock-shaft and a continuously-rotating shaft adjacent thereto, a duplex cam fixed on the latter, formed of two offset overlapping sections, lever-arms (Z 6', hung loosely on said rock-shaft and connected with each other by a cushioned arm, as set forth, and carrying in their free ends rolls that engage said duplex cam, an arm secured'to said rock-shaft, and a spring connecting said arm and the arms d 6, all substantially as and for the object specified.

DANIEL M. LESTER.

Vitnesses:

ALLEN TENNY, 1 FRANK H. ALLEN. 

